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X in (-oo:+oo)
7 = (2/3)*X // - (2/3)*X
7-((2/3)*X) = 0
(-2/3)*X+7 = 0
7-2/3*X = 0 // - 7
-2/3*X = -7 // : -2/3
X = -7/(-2/3)
X = 21/2
X = 21/2
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